21794135 has 16 divisors (see below), whose sum is σ = 29140992. Its totient is φ = 15511200.

The previous prime is 21794107. The next prime is 21794137. The reversal of 21794135 is 53149712.

It is not a de Polignac number, because 21794135 - 2⁸ = 21793879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1631 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (1821312).

Almost surely, 2^21794135 is an apocalyptic number.

21794135 is a deficient number, since it is larger than the sum of its proper divisors (7346857).

21794135 is a wasteful number, since it uses less digits than its factorization.

21794135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8494.

The product of its digits is 7560, while the sum is 32.

The square root of 21794135 is about 4668.4188972285. The cubic root of 21794135 is about 279.3271898761.

The spelling of 21794135 in words is "twenty-one million, seven hundred ninety-four thousand, one hundred thirty-five".